Abandoned culvert disposal methods

Abstract

This invention discloses a method for treating abandoned culverts, comprising: sealing the abandoned culvert in sections; pre-burying a delivery pipe and a grouting pipe in each section of the culvert, with one end of the delivery pipe located at the lower part of the section and one end of the grouting pipe located at the upper part of the section; injecting foamed lightweight soil into the section of the culvert through the delivery pipe, so that the foamed lightweight soil fills the section of the culvert; after the foamed lightweight soil in the section of the culvert has initially set, injecting cement slurry into the section of the culvert under high pressure through the grouting pipe, the cement slurry penetrating and reinforcing the foamed lightweight soil to form a composite reinforcement layer. This invention solves the problems of water and soil pollution, high treatment costs, and high settlement risks associated with traditional culvert demolition during urban road renovation and upgrading.

Description

Technical Field

[0001] This invention relates to the field of culvert treatment technology, and more specifically to a method for treating abandoned culverts. Background Technology

[0002] With the progress of urbanization, more and more cities need to upgrade and renovate their existing pipe networks to meet the functional requirements of urban pipelines. This inevitably requires the demolition of existing culverts, making culvert demolition a crucial part of the urban upgrading and renovation process.

[0003] Demolishing culverts in cities presents several challenges. First, it generates significant noise pollution, potentially contaminating surrounding water and soil and impacting local residents. Second, it produces substantial solid waste, subject to stringent local regulations and complex procedures for disposal. Designated disposal sites are often located far away, increasing transportation costs. Furthermore, the subsequent layered backfilling process is time-consuming and carries a high risk of settlement. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a method for treating abandoned culverts is provided to address the problems of water and soil pollution, high treatment costs, and high risk of settlement associated with traditional culvert demolition during urban infrastructure renovation and upgrading.

[0005] To achieve the above objectives, a method for disposing of abandoned culverts is provided, comprising the following steps: The abandoned culvert was sealed off in sections; A conveying pipe and a grouting pipe are pre-embedded in each segmented culvert. One end of the conveying pipe is located at the lower part of the segmented culvert, and one end of the grouting pipe is located at the upper part of the segmented culvert. Foamed lightweight soil is injected into the segmented culvert through the delivery pipe, so that the foamed lightweight soil fills the segmented culvert. After the foamed lightweight soil in the segmented culvert has initially set, cement slurry is injected into the segmented culvert under high pressure through the grouting pipe. The cement slurry penetrates and reinforces the foamed lightweight soil to form a composite reinforcement layer.

[0006] Furthermore, before sealing off the abandoned culvert in sections, debris inside the abandoned culvert is removed, ensuring that the interior of the abandoned culvert is unobstructed.

[0007] Furthermore, after the interior of the abandoned culvert is cleared, the V-shaped walls on both sides of the entrance and exit of the abandoned culvert are broken.

[0008] Furthermore, when sealing off abandoned culverts in sections, brick masonry is used to seal the abandoned culverts.

[0009] Furthermore, each segment of the abandoned culvert is 15m long.

[0010] Furthermore, the density of the foamed lightweight soil is 300~500 kg / m³. 3 The grouting pressure is 0.2~0.5MPa.

[0011] Furthermore, the water-cement ratio of the cement paste is 0.5, and the grouting pressure is 1.0~2.0 MPa.

[0012] The beneficial effects of this invention are that the abandoned culvert treatment method of this invention significantly improves the filling density and structural stability through layered grouting technology, and has the advantages of high construction efficiency, low cost and strong environmental protection, and is suitable for the rapid and safe backfilling of abandoned culverts.

[0013] The abandoned culvert treatment method of the present invention uses layered grouting technology. First, it injects highly fluid foamed lightweight soil to fill the voids in the main body of the culvert, and then injects cement slurry under high pressure for penetration and reinforcement, forming a composite reinforcement layer. This significantly improves the density of the filling and the overall structural strength, and effectively avoids the settlement risk that is easily generated by traditional backfilling processes.

[0014] The waste culvert treatment method of the present invention uses foamed lightweight soil with excellent fluidity and lightweight properties, which can quickly fill the culvert space, and the construction speed is fast. Compared with the traditional layered filling and compaction process, the efficiency is improved and the construction period is greatly shortened.

[0015] The method for treating abandoned culverts of the present invention has low construction costs, does not require complete demolition of abandoned culverts, reduces the use of large machinery and labor input; at the same time, it avoids a large amount of waste soil transportation and disposal costs, reduces transportation costs, and has significant overall economic benefits.

[0016] The method for treating abandoned culverts in this invention has good environmental protection effects, reducing noise, dust and solid waste pollution generated by culvert demolition, reducing the amount of excavated soil transported, meeting the requirements of green construction and environmental protection, and having little impact on the surrounding environment.

[0017] The method for treating abandoned culverts in this invention is highly adaptable and applicable to the treatment of various types of abandoned culverts, especially those that cannot be demolished or are not suitable for demolition during urban pipeline renovation. It has good potential for widespread application.

[0018] The abandoned culvert treatment method of the present invention has low maintenance costs in the later stage. By precisely grouting weak areas with steel pipes, the overall load-bearing capacity of the culvert is improved, the risk of later settlement or structural damage is reduced, and maintenance costs are reduced. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of an abandoned culvert according to an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of an abandoned culvert according to an embodiment of the present invention.

[0021] Figure label: Abandoned culvert 1; Delivery pipe 2; Grouting pipe 3; 4. Brick masonry. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Reference Figure 1 and Figure 2 As shown, the present invention provides a method for disposing of abandoned culverts, comprising the following steps: S1. Seal off abandoned culvert 1 in sections.

[0025] Before sealing off the abandoned culvert 1 in sections, remove the debris inside the abandoned culvert 1 to ensure that the interior of the abandoned culvert 1 is unobstructed.

[0026] Specifically, remove silt, gravel, and other debris from the culvert to ensure unobstructed flow. Clean the interior of abandoned culverts, remove water and silt from the interior of water-carrying culverts, and remove debris from the interior of through culverts.

[0027] After clearing the interior of abandoned culvert 1, the V-shaped walls on both sides of the entrance and exit of abandoned culvert 1 were removed.

[0028] Specifically, the concrete sloping walls on both sides of the culvert entrance and exit were demolished to expand the working area. A semi-circular stepped section was excavated along the abutment back, with each step being 1.5m wide and 1m high, parallel to the sloping walls, and connected to the excavation of the existing roadbed slope steps. Demolition was carried out using a combination of manual and mechanical methods, proceeding from top to bottom. Larger rock sections were first broken up using impact drills until they were manpowerable, then loaded onto trucks and transported to a designated location for storage. During the demolition of the concrete structure, a dedicated safety officer and quality inspector were assigned to keep detailed records.

[0029] When sealing off abandoned culvert 1 in sections, brick masonry 4 is used to seal off abandoned culvert 1.

[0030] As a preferred implementation, each segment of the abandoned culvert 1 is 15m long.

[0031] The two ends of the culvert were sealed with brick masonry to form a closed space. Ordinary sintered brick masonry (brick strength grade MU20, mortar strength grade M15) was used to seal the openings on both sides. During the sealing process, a grouting hole (10cm in diameter) was pre-reserved at the top of the higher opening, and a steel pipe with a diameter of 3.5cm was pre-embedded.

[0032] To ensure compaction of the filling and grouting, when the culvert is long, it needs to be filled in sections, with construction proceeding from the lowest point to the highest point. The length of each section can be controlled within 15m.

[0033] S2. A conveying pipe 2 and a grouting pipe 3 are pre-embedded in each segment culvert. One end of the conveying pipe 2 is set at the lower part of the segment culvert, and one end of the grouting pipe 3 is set at the upper part of the segment culvert.

[0034] S3. Foamed lightweight soil is injected into the segmented culvert through the delivery pipe 2, so that the foamed lightweight soil fills the segmented culvert.

[0035] Foamed lightweight soil is pumped through delivery pipes to fill the voids within culvert sections using its fluidity. The density of the foamed lightweight soil is 300~500 kg / m³. 3 The grouting pressure is 0.2~0.5MPa. Air-bubbly mixed lightweight soil is injected into the culvert through the grouting holes until grout flows out of the holes. The grouting holes are then sealed, allowing the foamed lightweight soil to fill the voids in the main structure. After grouting, the grouting pipe joint is removed, and the holes are quickly plugged with wooden stoppers. During construction, workers should not face the hole opening to avoid grout spraying onto their faces. The curing time after grouting should be at least 7 days.

[0036] S4. After the foamed lightweight soil in the segmented culvert has initially set, cement slurry is injected into the segmented culvert under high pressure through grouting pipe 3. The cement slurry penetrates and reinforces the foamed lightweight soil to form a composite reinforcement layer.

[0037] When sealing the abandoned culvert, a 24cm thick brick wall was constructed. One grouting hole was pre-installed on the higher side of the abandoned culvert for the installation of a delivery pipe, and two steel perforated pipes (spaced 1.2m apart) were pre-embedded. The grouting density was 400kg / m³. 3 Foamed lightweight soil, flow control 8m 3 / h. After 24 hours, cement grout is injected through the steel pipe (pressure 1.5MPa) until the grout overflows from the adjacent pipe.

[0038] The proportion of foamed lightweight soil is cement, foaming agent, and water mixed in a ratio of 1:0.02:0.6.

[0039] Add 3% expansion agent to cement paste.

[0040] After the lightweight soil mixed with air bubbles has initially set, a cement paste with a water-cement ratio of 0.5 is injected under high pressure through a grouting pipe (steel pipe) at a pressure of 1.0~2.0 MPa to form a composite reinforcement layer.

[0041] After the lightweight soil mixed with air bubbles has initially set, cement grout (using PO 32.5 ordinary Portland cement) is injected through pre-embedded steel pipes to compact the interior of the abandoned culvert. When the grouting pressure reaches 0.8 MPa (0.2 MPa for sandy soil), it is stabilized for 5 minutes. Once grout flows out of the duct, grouting is stopped and the grouting holes in the steel pipes are sealed. High-pressure injection of cement grout through the pre-embedded steel pipes achieves structural reinforcement and seepage prevention.

[0042] Weighing deviation of various grouting materials <3%, grouting hole position ±20mm. Grouting hole depth ≤100mm, grouting pressure (compared to design parameters) ±10%. Grout properties include density, viscosity, fluidity, setting time, compressive strength, etc. Solidified body properties include compressive strength, impermeability, durability, etc.

[0043] The abandoned culvert treatment method of the present invention significantly improves the filling density and structural stability through layered grouting technology, and has the advantages of high construction efficiency, low cost and strong environmental protection. It is suitable for the rapid and safe backfilling of abandoned culverts.

[0044] The abandoned culvert treatment method of the present invention uses layered grouting technology. First, it injects highly fluid foamed lightweight soil to fill the voids in the main body of the culvert, and then injects cement slurry under high pressure for penetration and reinforcement, forming a composite reinforcement layer. This significantly improves the density of the filling and the overall structural strength, and effectively avoids the settlement risk that is easily generated by traditional backfilling processes.

[0045] The waste culvert treatment method of the present invention uses foamed lightweight soil with excellent fluidity and lightweight properties, which can quickly fill the culvert space, and the construction speed is fast. Compared with the traditional layered filling and compaction process, the efficiency is improved by about 50%, and the construction period is significantly shortened.

[0046] The method for treating abandoned culverts of the present invention has low construction costs, does not require complete demolition of abandoned culverts, reduces the use of large machinery and labor input; at the same time, it avoids a large amount of waste soil transportation and disposal costs, reduces transportation costs, and has significant overall economic benefits.

[0047] The method for treating abandoned culverts in this invention has good environmental protection effects, reducing noise, dust and solid waste pollution generated by culvert demolition, reducing the amount of excavated soil transported by about 30%, meeting the requirements of green construction and environmental protection, and having little impact on the surrounding environment.

[0048] The method for treating abandoned culverts in this invention is highly adaptable and applicable to the treatment of various types of abandoned culverts, especially those that cannot be demolished or are not suitable for demolition during urban pipeline renovation. It has good potential for widespread application.

[0049] The abandoned culvert treatment method of the present invention has low maintenance costs. By precisely grouting weak areas with steel pipes, the overall load-bearing capacity of the culvert is improved, reducing the risk of later settlement or structural damage. Maintenance costs can be reduced by more than 30%.

[0050] The abandoned culvert treatment method of the present invention is an efficient, low-consumption, and environmentally friendly technical solution for the treatment of abandoned culverts. A conveying pipe for air-bubbly mixed lightweight soil is installed at the bottom of the abandoned culvert, and a grouting steel pipe is installed at the top. Efficient filling and reinforcement are achieved through step-by-step grouting, solving technical difficulties such as incomplete filling and unstable structure.

[0051] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A method for disposing of abandoned culverts, characterized in that, Includes the following steps: The abandoned culvert was sealed off in sections; A conveying pipe and a grouting pipe are pre-embedded in each segmented culvert. One end of the conveying pipe is located at the lower part of the segmented culvert, and one end of the grouting pipe is located at the upper part of the segmented culvert. Foamed lightweight soil is injected into the segmented culvert through the delivery pipe, so that the foamed lightweight soil fills the segmented culvert. After the foamed lightweight soil in the segmented culvert has initially set, cement slurry is injected into the segmented culvert under high pressure through the grouting pipe. The cement slurry penetrates and reinforces the foamed lightweight soil to form a composite reinforcement layer.

2. The method for treating abandoned culverts according to claim 1, characterized in that, Before sealing off the abandoned culvert in sections, remove the debris inside the abandoned culvert to ensure that the interior of the abandoned culvert is unobstructed.

3. The method for treating abandoned culverts according to claim 2, characterized in that, After the interior of the abandoned culvert is cleared, the V-shaped walls on both sides of the entrance and exit of the abandoned culvert are broken.

4. The method for treating abandoned culverts according to claim 3, characterized in that, When sealing off abandoned culverts in sections, brick masonry is used to seal the abandoned culverts.

5. The method for treating abandoned culverts according to claim 4, characterized in that, Each segment of the abandoned culvert is 15m long.

6. The method for treating abandoned culverts according to claim 1, characterized in that, The density of the foamed lightweight soil is 300~500 kg / m³. 3 The grouting pressure is 0.2~0.5MPa.

7. The method for treating abandoned culverts according to claim 6, characterized in that, The water-cement ratio of the cement paste is 0.5, and the grouting pressure is 1.0~2.0 MPa.

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